Circular sleeve coupling



FIG. 1 is a perspective view of a circular sleeve coupling, showing ournew design, as seen obliquely from the front;

FIG. 2 is a perspective view of the sleeve coupling, as seen obliquelyfrom the back; and,

FIG. 3 is a side elevation of the sleeve coupling, the opposite sidebeing a mirror image thereto.

The ornamental design for a circular sleeve coupling, as shown and described. 